Propeller.



C. R. HAAS.

PROPELLER.

APPLIGATION rILBn s112127, 1911.

N. l M

AHORA/EVS Patented Aug. 27, i912- By l CHARLESR. HAAS, BRIGHTWATER,BRITISH COLUMBIA, CANADA.

PROPELLER.

Specieationof Letters Patent.

Patented Aug. er, 191e.

Application led September 7, 1911. Serial No. 648,051.

ATo all whom t may concern.'

Be 1t known that I, CHARLES R. HAA'S, a subject of the King of GreatBritain, and 'a resident of Brightwater, in the Province of 5 BritishColumbia, Dominion of Canada,

have invented a new and Improved Propeller, of which the following'is afull, clear, and exactdescription.

My invention relates to propellers, and

l0 more particularly to propellers to be usedin connectlon withair-ships, and has for its object to provide one with an arm to whichthe blades are pivoted, resilient means be ing provided for holding theblades in a predetermined position relatively to the arm.

Additional objects of the invention areset forth in the followingspecification, in which the preferred form of my invention is described.

Reference is to be had to the accompanying drawings forming' a part ofthis speciication, in which similar characters of reference indicatecorresponding parts'in all `theligures, and in which-w 1 Figure 1 is aside elevation .of the propeller, showing its position when in motion;Fig. 2 is an end View of the propeller, showing the position of theblades when in motion; and Fig. 3 is va side elevation showing theposition of the blades when the propelleris' at rest.

By referring to the drawings, it will be seen that a shaft 5 is providedto which is 5 secured a radially disposed arm 6 extendlng 1n oppositedirections from said shaft. Two resilient blades 7 are provided, theblades being preferably rectangular in shape, as shown in Fig. 3 of thedrawings.

40 Each of these blades 7 has a plurality of sleeves 8 spaced apart, thearm 6 being disf posed in the said sleeves. On the arm 6 y between thesleeves 8 there are disposed rlcoiled springs 9, one tcrminalof each ofthese 4coiled springs being secured tothe arm 6, the other terminalsextending outwardly from the arm' 6 and being secured to the blades at10 at a distance from the arm 6. To the inner side of the blades, at adistance4 from the arm 6, are secured tie niembers 11, thel other endsofthese' tie members 1l being secured to thehub 12 mounted on the shaft5 to which the arm 6 is also secured. Some distance from the hub 12brace members 13 are secured to the shaft 5, these brace membersextending outwardly andbeing secured to the outer ends of the arm 6.Wing nuts 1l engage the threaded terminals 15 of the shaft 5, forpreventing the blades 7 from slipping therefrom. When the propeller isnot in use, the blades 7 are radially .disposed with their flat faceslying substantially in the same plane, one at each side of the shaft 5.I/Vhen the propeller is rotated, the springs 9 permit the blades to'bend, but as the inner ends of the blades are secured by the tie members11, the inner ends of the blades are permitted very little movementrelatively to the arm '6, although the ends of the blades at a distancefrom the shaft 5 are permitted to move a relatively considerabledistance. .The brace members 13 act as a check for the blades and limittheir movement by the springs 9..

Having thus described my invent-ion, I claim as new and desire to secureby Letters Patent 1. lIn a propeller, posed arm secured mounted torotate on the arm,

a shaft, a radially disresilient `means for moving the blade in onedirection blade mounted torotate on the arm, a tie member connecting theblade at a distance from the arm with the shaft, and a brace member.connecting the arm lwith the shaft and adapted to check the movementofthe blade.

4. In a propeller, a shaft, a radially-disposed arm secured to theshaft, a blade mounted `to rotate on the arm, a tie memto the shaft, ablade ber connecting the blade at a. distance from name to thisspecification in the presence of lheledarm ilwlitl) the shaft, resilientmeans for two subscribing Witnesses.

o ing t e ladein a. predetermined osition relatively to the arm, and abrace Iem- CHARLES R' HAAb' 5 ber connecting the arm with the shaft andWitnesses:

adapted to check the movement of the blade. G. WHITEHEAD,

-In testimony whereof I have signed my JOHN KIRKPATRICK.

